ci: setup release tools

Author: ymtszw

.github/workflows/publish.yml

@@ -0,0 +1,25 @@
+name: Hex Publish
+
+on:
+  push:
+    tags:
+      - "v*"
+
+permissions:
+  contents: read
+
+jobs:
+  publish:
+    name: Publish to Hex
+    runs-on: ubuntu-20.04
+    steps:
+      - uses: actions/checkout@v3
+      - uses: erlef/setup-beam@v1
+        with:
+          elixir-version: "1.14"
+          otp-version: "24"
+      - run: mix deps.get
+      - run: mix test
+      - run: mix hex.publish --yes
+        env:
+          HEX_API_KEY: ${{ secrets.HEX_API_KEY }}

release.sh

@@ -0,0 +1,14 @@
+#!/usr/bin/env bash
+set -euo pipefail
+
+# Release script
+#
+# Usage:
+# 1. Set new version in mix.exs
+# 2. Commit and push
+# 3. Run ./release.sh
+# 4. Let .github/workflows/publish.yml to publish
+
+version=$(mix run -e 'IO.puts(Mix.Project.config[:version])')
+git tag "v$version"
+git push "v$version"